Continuous projector for natural color projection



Dec. 11, 1934. w. A. KOSKEN 1,984,142

CONTINUOUS PROJECTOR FOR NATURAL COLOR PROJECTION Original Filed Maroh 17, 1950 3 Sheets-Sheet l A. OSKEN INVENTOR W LH 0 BY; 2

ATTORNEY llli W. A. KOSKEN Dec.ll, 1934.

CONTINUOUS PROJECTOR FOR NATURAL COLOR PROJECTION Original Filed March 17, 1930 3 Sheets-Sheet 2 I l l I INVENTOR W/LHO A. KOSKEN ATTORNEY t mi B .mo Q2235 m b I 5 *0 Q2325 E Q: w tE S Q K 32a um; 21% 595 m2 m ncmmao c 5 x3 tk F :====3:==== :2 k fitu o 8 E 3 59% mE $3 598 c335 5612 E E;EECEEEECEECEEEEEEEE Dec. 11, 1934. w. A. KOSKEN 1,984,142

CONTINUQUS PROJECTOR FOR NATURAL COLOR PROJECTION Original Filed March 17/1930 3 Sheets-Sheet 5 INVENTOR W/LHO A. KOSKEN ATTORN EY Patented Dec. 11, 1934 PATENT OFFICE CONTINUOUS PROJECTOR FOR NATURAL COLOR PROJECTION Wilho A. Kosken, New York, N. Y., assignor to 'Wilho A. Kosken, Inc.,

York

Application 4 Claims.

a corporation of New March 17, 1930, Serial No. 436,563 Renewed May 7, 1934 (Granted under the provisions of sec. 14, act of March 2, 1927; 357 0. G. 5)

' 'l-his' invention relates to motion picture proj'ectors for projecting images in natural color and tionfrom a series of images carried on a '5 object of the invention is to provide apparatus for superimposing a plurality of images each of an individual color value in the form of ac'ombined secondary image in true color and then to project the so combined secondary image.

16' Z' Particularly; an object of my invention is to combine a plurality of individual color images-from a continuously uniformly moving film by optically compensating-means into a single true color secondary image and the projection of said secondary image.

A further object of my invention is to provide a novel process and eflicient-apparatus for projecting motion pictures in natural color without the mechanical superpositioning of image bearing parts.

Theabove and further objects will be pointed out more in detail in the following claims which are directed to illustrative embodiments of my invention described in the following specification in connection with the accompanying drawings which form a part hereof.

This reference to the illustrative embodiments is solely for purposes of illustration and not limitation.

' In the drawings, 1 is 'a diagrammatic representation of one method and means for combining-three color images into one combined secondary image and should be understood to be applicable to projector mechanism in which the film movement is either intermittent or continuous and uniform although it is actually shown complete only for film which is to be driven continuously;

Fig. 2 is a diagrammatic representation of the preferred combining lenscohstruction;

Fig. 3 is a diagrammatic illustration of three similar combining lenses which may be substituted for the showing in Fig. 2;

v Fig. 4 is a diagram illustrating the adaptation of my invention to optically compensating mechanism of the type described in my copending application entitled Continuous projector with slow speed deflectors, filed March 17; 1930 and fur- 50 ther designated as Serial. Number 436,562;

Fig. 5 is a'plan view of the film indicated in Figi 6 is a plan view of another form of film in which the color filteris stained iipon each 56 Fig. 7 is a side. elevation of complete apparatus suitable for the practice of my invention.

Referring now more in detailto the drawings, three lenses A, B and C are arranged side by side and are ground or otherwise fabricated and are relatively tilted one to another so as to produce a single compound secondary image E from three separate images carried by a film F and indicated respectively red, green and blue.

In Fig. 1 the film is shown preferably curved by means of a film gate N preferably of a radius equal to twice its distance from the secondary image E.

The lens combination A B C may be three complete disc-shaped lenses or lens barrels as indicated in Fig. 3 although I prefer to grind a single lens comprising two blanks A and B cemented together along the line 7 and to grind a second complete lens C, later cutting away the shaded portions to leave .the central part 8, which is later combined as indicated at the right of Fig. 2.

In Fig. 4 the film F is shown combined with the optically compensating mechanism of my copending application above identified and it may be an ordinary black and white film as indicated in Fig. 5, in which the images represent in repeated series of three each a black and white image taken through a red filter, then a black and white image taken through a green filter, and then a black and white image taken through a. blue filter, and so on, it being preferred that each A of these images correspond to the same position and viewpoint of the scene from which the image is made.

In the apparatus of Fig. 4 a color belt F" is driven to move in synchronism with the film F and is provided with alternating red, green and blue sets one after the other of color filters, it being understood that'any suitable source of light beam originates the light rays indicated in dash lines in this figure. It is the feature of my copending application above identified, by which several complete independent images may be projected with optical compensation at the same time. that makes this color projection possible.

In the diagrammatic illustration of Fig. 4, the lens part B is always receiving the image projection positioned first in accordance with the direction of motion for the film F. The lens part ,50

C is always projecting a following image part if any and the lens A isalways projectinga third following image part if any. For the position of the film and color belt F" illustrated, 'the lens parts B, C and A are respectively combining into a single secondary image E the red, the green and the blue images. For a one frame increment of movement of the continuously moving film, this order of handling the images changes so that the lens parts B, C and A are respectively projecting the green, the blue and the red image parts.

It is to be understood that the film F of Fig. 6 may be substituted for the film F and the color belt F" of Fig. 4. In this film of Fig. 6 each image, according as to whether in black and white it was photographed through a red, green or blue filter, is dyed or painted with transparent. filtering coloring material of corresponding colors,

namely, red, green or, blue, and by this expedient does away with the nece ity of a synchronized color belt.

In the apparatus forprojecting the images of this invention, S indicates the light source and preferably a single barrel 200 is employed for adjusting the three lens parts A, B and C whereby .the secondary image E is brought to a focus at the locality indicated. A second lens system 201 is provided mounted coaxially with that of the lens system 200 and serves to project the image upon a screen. The lens barrel 200 in this figure substitutes for the lens barrel N in the apparatus described in my above identified copending application, otherwise the projection apparatus is the same as that described in the said application, the corresponding parts being indicated herein by the said characters. All the moving parts are driven preferably from a single motor J which is worm to worm gear connected to drive the gear B. The defiectors G are carried by a continuous chain of carrier blocks 11 working in the special guideway 101 and driven to eifect true compensation in accordance with my disclosure in copend ing applications... The deflectors G are wedgeshaped, each providing two symmetrical surface reflectors, the reflector of one wedge cooperating with the adjacent reflector of the adjacent wedge.

I am, of course, aware of the fact that the optical combining of my several images into'a single compound secondary image does not theoretically work out with mathematical accuracy. The inaccuracy, however, is so well within the limits of human vision as not to be appreciable or to impair the results obtained.

What I claim and desire to secure by United States Letters Patent is:

1. In a projector for motion pictures in natural color in combination, means adapted to move with continuous uniform motion a film bearing a linear. series of sets of positioned images, each image of each set corresponding in black and white to a primary color value of the object from which the image is photographed; means for projecting a light beam through the path of travel of said images and appropriate corresponding color means; stationary plural lens means for combining in said. projected beam a number of contiguously grouped images, said number corresponding with the number of images in one of said sets in the form of a combined-secondary image; a series of continuously moving deflectors compensating for the continuous uniform motion of said film; and means for projecting said secondary image to'produce natural color, all said means utilizing the said first mentioned light beam for the true projection of images.

2. In a projector for motion pictures in simulating natural color, in combination, means adapted to move with continuous uniform motion a film bearing a series of sets of sequentially positioned images, each image of each set corresponding in black and white to a primary color value of the object from which the image has been photographed; means for projecting a light beam through the path of travel of said images and appropriate corresponding color means; a fixed multiple lens system for combining in said projected beam a number of contiguously grouped images, said number corresponding with the number of images in one of said sets, in the form of a combined secondary image; continuously moving deflector means between the path of travel of said film and said fixed multiple lens system compensating for the continuous travel of said images; and means for projecting said combined secondary image to produce simulated natural color, all said means utilizing the said first mentioned light beam for the true projection of im- I ages.

3. In combination, means adapted to move with continuous motion a film bearing a series of sequence sets of black and white images in which each set comprises a plurality of images, each corresponding to an individual color value of a scene; means for projecting a light beam across the path of travelof said film; a fixed plural lens system for combining in said light beam a plurality of said images from said film into a combined secondary image to produce simulated natural color; movable deflector means interposed between the path of travel of said film and said fixed plural lens system compensating for the continuous travel of said film; and means for projecting said combined secondary image by means of the said first mentioned light beam.

4. In a motion picture projector for color pho-' tography, means adapted to move with a continuous uniform motion a film carrying a plurality of groups of images in series array vary ing in increments of position from group to group but identicalas to position for the images of each said group and within each group said images varying in color value; means for projecting a light beam across the path of travel of said film; a series of compensating deflectors for optically compensating the continuous motion of said film; anda fixed plural lens system for combining a plurality of color images projected by light beams d rived from said first mentioned light beam '0 rough said moving film into a single combined secondary image in simulated true .color; appropriate color filtering means synchronized for motion with said film; and means utilizing the projected light of said first mentioned light beam for projecting said combined secondary image as a. stationary image in simulated true color.

WILHO A. KOSKEN. 

